The Dems did some delegate fuckery where all candidates endorsed Biden because Bernie Trump had to be stopped at all cost, and their delegates went to Biden even if he hadn’t been voted for. Kamala contributed all of her 0 delegates and got VP for being a cop the first to drop out iirc.
they actively work to ensure don’t make it. Manchin, Sinema and others like them are greatly valued by Dems for their role as scapegoats.